No description available.

No description available.

The purpose of this thesis is to prepare and characterize translucent glass ceramics. The procedure was as follows, first a general background of the field is presented where the problems with current dental glass ceramics are presented, together with their history. The need for a stronger material is then clarified with the addition of new metals. Then the material is created and synthesized using the Sol-Gel process, and a thorough description of the process is presented along with the material used. During this process Manganese, Aluminum, and Magnesium is added to the glass ceramics, and their powder is later pressed using different methods, cold isostatic pressing (CIP) and hot isostatic pressing (HIP). The material is then sintered at different temperatures and a series of testing is then done to the doped glass ceramics. Mechanical testing, Nanoidentation, X-ray powder diffraction and density measurement show that the strongest material is the 0.5mol Manganese doped glass ceramic. The Manganese doped samples are only strong to a certain level of doping, if doped too much become weak. The Magnesium doped samples are also more porous than the other samples.

This experimental investigation examines the influence of surface treatment on the strength of low-fired tempered ceramic bodies. Specimens prepared with commercial raw materials are employed, either finger-smoothed, burnished, textured, slipped/burnished, or resin coated; two building techniques, coiling and paddle-and-anvil, are also included since these forming processes affect the vessel surface. The modulus of rupture or flexural strength is determined by means of a four-point bending test, which is sensitive to critical surface flaws. By means of a univariate analysis of variance, small differences in strength are found between ceramic briquettes with different surface treatments. Although the differences in means for the moduli of rupture values are statistically significant, the differences are of such a low magnitude that they cannot be considered behaviorally relevant. These results are only valid for the materials, mode of preparation, and test procedures employed.

Thesis (M.S.)--University of Michigan, 1995. / Includes bibliographical references.

No description available.

Thesis (Ph. D.)--University of Washington, 1988. / Vita. Includes bibliographical references.

Thesis (M.S.)--University of Michigan, 1986.

Thesis (doctoral)--Ludwig-Maximilians-Universität zu München, 1933. / Includes bibliographical references (p. [17-18]).

Thesis (doctoral)--Ludwig-Maximilians-Universität zu München, 1933. / Includes bibliographical references (p. [17-18]).